Per a source, Brent was returning from partying at Club Privae in Dallas and was traveling at a high rate of speed before losing control of his vehicle. When police arrived on the scene, Brent was responsive, the deceased was not. He was taken to a local hospital where he was pronounced dead.

Police conducted a field sobriety test on Brent and also drew blood before taking him to jail.

The Cowboys made a roster Saturday morning before departing for Sunday's game against the Bengals, signing defensive tackle Robert Callaway from the practice squad and putting cornerback Orlando Scandrick on injured reserve.

This is second tragic incident in the last week for the NFL, following last Sunday's murder-suicide involving Kansas City Chiefs linebacker Jovan Belcher and his girl friend Kassandra Perkins.

It's also the second time in the last decade that an active Cowboys player was involved in a traffic fatility.

Cornerback Dwayne Goodrich was involved in a hit and run accident that killed two people in 2003. He was convicted on two counts of criminally negligent homicide and served eight years in prison before being released in 2011.

Dallas Cowboys defensive lineman Josh Brent was arrested in Texas early this morning on charges of intoxication manslaughter involving a car accident in which a teammate died ... TMZ has learned.

Irving PD says Brent and a member of the team's practice squad, Jerry Brown, were involved in a single car accident around 2:30 AM local time and that Brown died as a result.

According to police, Brent was driving at a high rate of speed when his car "hit the outside curb," flipped over and came to rest in the middle of the road. Brent was responsive at the scene, but Brown was not. Brown was later pronounced dead at a nearby hospital.

Officers at the scene suspected alcohol to be a factor, so they gave Brent was given a field sobriety test, which he failed. His blood was also taken at the hospital to determine his blood alcohol level.

He was arrested by Irving PD and booked on a second degree felony charge at 4:14 AM and is being held without bail.

Brent pled guilty to a misdemeanor DUI charge while in college.

Dallas Cowboys owner Jerry Jones released a statement today, saying, "We are deeply saddened by the news of this accident and the passing of Jerry Brown. At this time, our hearts and prayers and deepest sympathies are with the members of Jerry’s family and all of those who knew him and loved him."

The incident comes just one week after Kansas City Chiefs linebacker Jovan Belcher killed his girlfriend and then himself.